July 23, 2014

Homework Help: To DrBob222

Posted by Sara on Thursday, April 22, 2010 at 7:59pm.

Can you please explain thoroughly to me about all this.

Why do we criss cross the formulas of compounds?

How do we find out which combining capacity to use if there are more than one? Is there a special formula we use to find out or something? I really do not understand.

After explaining all that, can you please check to see if I've done these questions correctly. Thank you very much in return.

Criss cross to write the formulas of the following compounds. Here are some example below which have totally made me lose my head.

Calcium Chloride = CaCl2
Why can't we write the one in, by Calcium?

In this example they do:

Magnesium Hydroxide = Mg1OH2

Why do they put the one in this example, and not the first one? That just totally confuses me.

Anyways, here are the questions:

1. Potassium Selenide = K2Se

2. Magnesium Nitrate = Mg(No3)2

3. Lithium Flouride = LiF1

4. Sodium Oxide = Na2O

5. Iron III Bromide = FeBr3

6. Potassium Hydroxide = Ki(OH)2

7. Beryllium Phosphide = Be3P2

8. Lithium Sulphide = Li2S

9. Calcium Oxide = Ca(Co)

10. Cobalt II Nitride = Co3N2

11. Ammonium Chloride = (NH4)Cl

12. Beryllium Sulphate = Be(SO4)

Please correct any of my mistakes. I'll appreciate all the help you could give me:-)

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